Why does the c++ API not allow non-power-of-2 buffer sizes when CLI is perfectly fine with it?

[BlackspireAudio]

I can run jackdmp with ALSA backend with 48 sample buffer size and it works perfectly.
I can even setup the jack server and connect to it using my c++ jack client at 48 sample buffer size and it also works perfectly.
But when I try to set the buffer size to 48 using the jack_set_buffer_size API method, it asserts that the buffer size needs to be a power of 2.
What is the reason for this limitation?
Is there any way around it?

System Specs:
Jetson Orin NX
Ubuntu 20.04.6 LTS (Jetpack 5.1.2)
libjack-dev/focal,now 1:0.125.0-3build2 arm64
jackd version 0.125.0rc1

[BlackspireAudio]

Nevermind
I just realized that I was working with jackd1 this whole time.
I installed libjack-dev based on a forum post and didin't think about checking the related jack version.
Turns out that installing this library replaced my jackd2 package with jackd1.
Now that I'm running the correct versions it works fine:
jackd2:1.9.12~dfsg-2ubuntu2
libjack-jackd2-dev: 1.9.12~dfsg-2ubuntu2